In photography, a shutter is a device that allows light to pass for a determined period of time, for the purpose of exposing photographic film or a light-sensitive electronic sensor to light to capture a permanent image of a scene.
Shutter speed on exposure
Fast shutter speeds let in less light, and if aperture doesn't change as the speed gets longer it lets in more light and the picture gets lighter (over-exposed). And it is also true if shutter speed gets shorter and aperture doesn't change and the picture gets darker (under-exposed)
Shutter speed effect in motion
When trying to freeze action, the faster the subject is moving the faster the shutter speeds must be. A long shutter speed will result in a blurry image, suggesting the subject in motion.
Aperture/shutter¬-speed relationships: Identical exposure can be given through a range of intensity/time settings. For example, each combination here will give the same light effect to the film. With a manual set camera you can choose between them, paying attention to depth of field and blur effects.
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Example of a picture taken with slow shutter speed:
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Example of a picture taken with fast shutter speed::
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Difference in exposure with change in shutter speed:
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1/1250 sec
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1/1000 sec
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1/125 sec
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*1/25 sec
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